mod 함수를 이용한 나누기

public class test {

	public static void main(String[] args) {
		int num = 12345;
		int sum = 0;

		sum = sum + (num / 10000);
		num = num - ((num / 10000) * 10000);

		sum = sum + (num / 1000);
		num = num - ((num / 1000) * 1000);
  
		sum = sum + (num / 100);
		num = num - ((num / 100) * 100);  
  
		sum = sum + (num / 10);
		num = num - ((num / 10) * 10);
  
		sum += num;

		System.out.println("sum = " + sum);

	}

}